Cylinders of two stroke internal combustion engines



Oct. 16, 1934. 1,977,557

OF TWO-STROKE INTERNAL COMBUSTION ENGINES J. L. JAMESON CYLINDERS Filed Sept. 21, 1933 INVENTOR Jose h L- Jameson ATTgNLY Patented Oct. 16, 1934 PATENT orrics CYLINDERS OF TWO STROKE INTERNAL COMBUSTION ENGINES Joseph Lambert Jameson, Cheam, England Application September 21, 1933, Serial No. 690,479 In Great Britain July 15, 1932 3 Claims.

This invention relates to internal combustion engines of the two stroke cycle type having exhaust ports in the cylinder wall adapted to be opened or closed by the working piston and has &5 for its object to provide an improved cylinder construction embodying also improved arrangements for cooling the cylinder and exhaust passages.

According to the invention, an internal com-- bustion engine of the kind referred to is provided wherein the working cylinder or each working cylinder consists of a cast or wrought metal liner adapted to be removably mounted within an engine housing and having formed integral with it flanges with end walls adjacent exhaust ports forming an exhaust duct or chamber common to said ports.

The invention also consists in an internal combustion engine of the kind referred to where- -1in a group of cylinders is formed as a unit detachable from the engine housing, the cylinders comprising sleeves or liners formed integral with flanges forming a common exhaust duct or chamber along eitheror both sides of the cylin- -1 der group.

The invention further consists in an internal combustion engine of the kind referred to where in the cylinders comprise a group of sleeves or liners formed separately or as a unit and spaced at their upper and lower ends to form spaces for circulation of a cooling medium around and between them and formed integral with exhaust ducts or chambers disposed along each side of the cylinder group.

Reference will now be made to the accompanying drawing which illustrates by way of example a construction according to the invention and in which:-

Fig. 1 is a longitudinal sectional elevation and Fig. 2 is a part cross sectional elevation. In the construction illustrated the cylinders of a two stroke cycle internal combustion engine each consist of a sleeve or liner at having a series of exhaust ports b formed therein, and separated by spaces 0 which serve for the circulation of a cooling medium.

Adjacent the exhaust ports and extending along each side of the engine housing are -formed two outwardly diverging flanges d, with which the liners a are-formed integral, enclosing an exhaust duct or chamber e with outwardly flaring upper and lower walls which is connected to an exhaust conduit f. The liners shown in Fig. 1 are removably mounted in the engine housing 2 and their upper and lower ends are spaced by plates g which also serve to enclose the cooling spaces 0. The cooling spaces 0 are also in communication with cooling spaces It above and below the exhaust chamber, which spaces 71. are closed by elements It detachable from the exhaust chamber 2. The invention besides enabling the cylinder wall and exhaust ports to be renewed, also reduces the thickness of metal employed as compared with cylinders cast in one piece with the water jackets, enables more effective cooling to be obtained and obviates to a large extent port-lip corrosion and the liability of the port to close from excessive oil carbonization. Further, the space necessary for exhaust gas clearance is provided without any surplus of metal and the exhaust trunk adjacent the working cylinder is cooled to the maximum possible extent.

It is to be understood that modifications may be made in the construction above described without departing from the invention. For example, if the invention is applied to a single cylinder engine the exhaust chamber will be annular in shape.

I claim:-

1. In a multi-cylinder internal combustion engine, a cylinder block comprising a number of liners having their main walls out of contact with each other, a duct common to and integral with said liners extending longitudinally of the liners and outwardly from one side thereof, the main walls of said liners having ports therethrough surrounded by the duct and establishing communication between the liners and duct, a housing in which said block is removably disposed in water-tight relation with the duct at a location in spaced relation to the liners, and elements disposed between the housing and liners adjacent the ends of said liners to complete. a water-jacket about the liners.

2. In a multi-cylinder internal combustion engine, a cylinder block comprising a number of liners having their main walls out of contact with each other, a duct common to and integral with said liners extending longitudinally of the liners and outwardly from one side thereof, the main Walls of said liners having ports therethrough surrounded by the duct and establishing communication between the liners and duct, a

housing in which said block is removably disposed in water-tight relation with the duct at a location in spaced relation to the liners and in water-tight relation with the liners adjacent the opposite ends thereof.

ing communication between the liners and duct, a housing in which said block is removably disposed in water-tight relation with the duct at a location in spaced relation to the liners, and means coacting with the housing and liners adjacent the ends of said liners to complete a. Water-jacket about the liners.

JOSEPH LAMBERT JAMESON. 

